The independent variable EqRatio, in contrast, is transformed by using a cubic spline with four knots. The dependent variable NOx was specified with an IDENTITY transformation, which means that it will not be transformed, just as in ordinary regression. The PLOTS= option requests plots of the variable transformations, a plot of the observed values by the predicted values, and a plot of the residuals. The SS2 (Type II sums of squares) a-option requests regression and ANOVA results. For many models, PROC TRANSREG with the SOLVE a-option can produce exact results without iteration. The SOLVE algorithm option, or a-option, requests a direct solution for both the transformation and the parameter estimates. Where fuel in ('Ethanol', '82rongas', 'Gasohol') Model identity(nox) = spline(EqRatio / nknots=4) Proc transreg data=Gas solve ss2 plots=(transformation obp residuals) * Request a Spline Transformation of Equivalence Ratio Model Statement Usage Box-Cox Transformations Using Splines and Knots Scoring Spline Variables Linear and Nonlinear Regression Functions Simultaneously Fitting Two Regression Functions Penalized B-Splines Smoothing Splines Smoothing Splines Changes and Enhancements Iteration History Changes and Enhancements ANOVA Codings Missing Values Missing Values, UNTIE, and Hypothesis Tests Controlling the Number of Iterations Using the REITERATE Algorithm Option Avoiding Constant Transformations Constant Variables Character OPSCORE Variables Convergence and Degeneracies Implicit and Explicit Intercepts Passive Observations Point Models Redundancy Analysis Optimal Scaling OPSCORE, MONOTONE, UNTIE, and LINEAR Transformations SPLINE and MSPLINE Transformations Specifying the Number of Knots SPLINE, BSPLINE, and PSPLINE Comparisons Hypothesis Tests Output Data Set OUTTEST= Output Data Set Computational Resources Unbalanced ANOVA without CLASS Variables Hypothesis Tests for Simple Univariate Models Hypothesis Tests with Monotonicity Constraints Hypothesis Tests with Dependent Variable Transformations Hypothesis Tests with One-Way ANOVA Using the DESIGN Output Option Discrete Choice Experiments: DESIGN, NORESTORE, NOZERO Centering Displayed Output ODS Table Names ODS Graphics
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